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SPF-record / E-mail marked as spam in Gmail

E-mail send from my own e-mail (info@dreamwoods.nl) to a Gmail-account is marked as spam. When I view the e-mail headers you will see a softfail. I have tried to set the SPF-record for my domain, but I keep getting a softfail:

Received-SPF: softfail (google.com: domain of transitioning info@dreamwoods.nl does not designate 2a02:348:83:cc40::1 as permitted sender) client-ip=2a02:348:83:cc40::1;

2a02:348:83:cc40::1 =

I have tried to set different SPF-records for the domainname: dreamwoods.nl, an example:

v=spf1 ip4: ~all

The e-mail-headers can be viewed here: MX Toolbox

What SPF-record to I need to set in order to 'pass' for the SPF?